ceph: add struct version to auth encoding

Inlucde struct version in encoding. This will streamline future protocol
changes.

Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/auth_none.c b/fs/ceph/auth_none.c
index 631017e..b4ef6f0 100644
--- a/fs/ceph/auth_none.c
+++ b/fs/ceph/auth_none.c
@@ -62,6 +62,7 @@
 	if (!ai->built_authorizer) {
 		p = au->buf;
 		end = p + sizeof(au->buf);
+		ceph_encode_8(&p, 1);
 		ret = ceph_entity_name_encode(ac->name, &p, end - 8);
 		if (ret < 0)
 			goto bad;